Penny Wise, Printer Foolish: 10 Ways Not to Save Money on Printing - 'Focus on the Cost of Cartridges' (
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When you consider consumable costs as part of your buying decision, don't just compare the cost per cartridge. What matters is the cost per page -- the cartridge cost divided by the number of pages it prints. If a cartridge prints enough pages, that shockingly high price for the cartridge will translate to a low cost per page.